package com.wph.gulimall.product.service.impl;

import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import com.wph.common.constant.ProductConstant;
import com.wph.common.utils.PageUtils;
import com.wph.common.utils.Query;
import com.wph.gulimall.product.dao.AttrAttrgroupRelationDao;
import com.wph.gulimall.product.dao.AttrGroupDao;
import com.wph.gulimall.product.dao.CategoryDao;
import com.wph.gulimall.product.entity.AttrAttrgroupRelationEntity;
import com.wph.gulimall.product.entity.AttrGroupEntity;
import com.wph.gulimall.product.entity.CategoryEntity;
import com.wph.gulimall.product.service.CategoryService;
import com.wph.gulimall.product.vo.AttrGroupRelationVo;
import com.wph.gulimall.product.vo.AttrRespVo;
import com.wph.gulimall.product.vo.AttrVo;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;

import com.wph.gulimall.product.dao.AttrDao;
import com.wph.gulimall.product.entity.AttrEntity;
import com.wph.gulimall.product.service.AttrService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

import javax.annotation.Resource;


@Service("attrService")
public class AttrServiceImpl extends ServiceImpl<AttrDao, AttrEntity> implements AttrService {

    @Resource
    AttrAttrgroupRelationDao attrAttrgroupRelationDao;

    @Resource
    AttrGroupDao attrGroupDao;

    @Resource
    CategoryDao categoryDao;

    @Resource
    CategoryService categoryService;

    @Autowired
    AttrDao attrDao;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<AttrEntity> page = this.page(
                new Query<AttrEntity>().getPage(params),
                new QueryWrapper<AttrEntity>()
        );

        return new PageUtils(page);
    }

    //这个方法也是一个事务才行，因为是关联表，涉及到多个表的操作来进行数据同步
    @Transactional
    @Override
    public void saveAttr(AttrVo attr) {
        AttrEntity attrEntity = new AttrEntity();//这是一个po 用来对应数据库的
        //spring家的（O(∩_∩)O哈哈~）   attr是对源象，attrEntity是目标对象  前提是属性名必须是一一对应的。
        BeanUtils.copyProperties(attr,attrEntity);

        //1、保存基本数据
        this.save(attrEntity);

        //2、保存关联关系
        if (attr.getAttrType() == ProductConstant.AttrEnum.ATTR_TYPE_BASE.getCode() && attr.getAttrGroupId()!=null){
            AttrAttrgroupRelationEntity attrAttrgroupRelationEntity = new AttrAttrgroupRelationEntity();
            attrAttrgroupRelationEntity.setAttrGroupId(attr.getAttrGroupId());
            attrAttrgroupRelationEntity.setAttrId(attrEntity.getAttrId());
            attrAttrgroupRelationDao.insert(attrAttrgroupRelationEntity);
        }



    }


    @Override
    public PageUtils queryBaseAttrPage(Map<String, Object> params, Long catelogId, String type) {

        QueryWrapper<AttrEntity> attrEntityQueryWrapper = new QueryWrapper<AttrEntity>()
                .eq("attr_type","base".equalsIgnoreCase(type)?ProductConstant.AttrEnum.ATTR_TYPE_BASE.getCode():
                        ProductConstant.AttrEnum.ATTR_TYPE_SALE.getCode());

        if (catelogId != 0){
            // .eq("attr_type","base".equalsIgnoreCase(type)?1:0 查询销售属性，或者规格参数
            attrEntityQueryWrapper.eq("catelog_id",catelogId);
        }

        String key = (String) params.get("key");
        if (!StringUtils.isEmpty(key)){
            //前面可能已经拼装了 eq("catelog_id",catelogId); 所以下面用and
            attrEntityQueryWrapper.and((wrapper)->{
                wrapper.eq("attr_id", key).or().like("attr_name", key);
            });
        }

        //分页查询，需要自己详细理解，学了mybatis-plus后
        IPage<AttrEntity> page = this.page(
                new Query<AttrEntity>().getPage(params),
                attrEntityQueryWrapper
        );

        PageUtils pageUtils = new PageUtils(page);


        //获取分页之后得到的记录
        List<AttrEntity> records = page.getRecords();
        //流式编程  对立面的每一个元素做处理
        List<AttrRespVo> respVos = records.stream().map((attrEntity) -> {
            AttrRespVo attrRespVo = new AttrRespVo();
            BeanUtils.copyProperties(attrEntity, attrRespVo);

            //1、设置分类和分组的名字
            // 销售属性不需要设置分组
            if ("base".equalsIgnoreCase(type)){
                //1)、selectOne 非id查询时的查询   ------通过中间表查询分组的名字
                AttrAttrgroupRelationEntity attr_id = attrAttrgroupRelationDao.selectOne(new QueryWrapper<AttrAttrgroupRelationEntity>()
                        .eq("attr_id", attrEntity.getAttrId()));
                if (attr_id != null && attr_id.getAttrGroupId()!=null) {
                    AttrGroupEntity attrGroupEntity = attrGroupDao.selectById(attr_id.getAttrGroupId());
                    attrRespVo.setGroupName(attrGroupEntity.getAttrGroupName());
                }
            }




            //2)、------查询分类名字
            CategoryEntity categoryEntity = categoryDao.selectById(attrEntity.getCatelogId());
            if (categoryEntity != null) {
                attrRespVo.setCatelogName(categoryEntity.getName());
            }
            return attrRespVo;
            //流式  处理之后还需要搜集
        }).collect(Collectors.toList());

        pageUtils.setList(respVos);
        return pageUtils;
    }


    //        attrRespVo.setAttrGroupId();
    //        attrRespVo.setCatelogPath();
    @Override
    public AttrRespVo getAttrInfo(Long attrId) {
        AttrRespVo attrRespVo = new AttrRespVo();
        AttrEntity attrEntity = this.getById(attrId);
        BeanUtils.copyProperties(attrEntity, attrRespVo);

        if (attrEntity.getAttrType() == ProductConstant.AttrEnum.ATTR_TYPE_BASE.getCode()){
            //1、设置分组信息
            //1)、selectOne 非id查询时的查询   ------通过中间表查询分组的id
            AttrAttrgroupRelationEntity attrAttrgroupRelationEntity = attrAttrgroupRelationDao.
                    selectOne(new QueryWrapper<AttrAttrgroupRelationEntity>()
                            .eq("attr_id", attrId));
            if (attrAttrgroupRelationEntity != null) {
                attrRespVo.setAttrGroupId(attrAttrgroupRelationEntity.getAttrGroupId());
                //设置分组名字
                AttrGroupEntity attrGroupEntity = attrGroupDao.selectById(attrAttrgroupRelationEntity.getAttrGroupId());
                if (attrGroupEntity != null){
                    attrRespVo.setGroupName(attrGroupEntity.getAttrGroupName());
                }
            }
        }


        //2、设置分类信息
        Long catelogId = attrEntity.getCatelogId();
        Long[] catelogPath = categoryService.findCatelogPath(catelogId);
        attrRespVo.setCatelogPath(catelogPath);
        //设置分类的名字
        CategoryEntity categoryEntity = categoryDao.selectById(catelogId);
        if (categoryEntity != null){
            attrRespVo.setCatelogName(categoryEntity.getName());
        }
        return attrRespVo;
    }


    @Transactional
    @Override
    public void updateAttr(AttrVo attr) {
        AttrEntity attrEntity = new AttrEntity();
        BeanUtils.copyProperties(attr, attrEntity);
        this.updateById(attrEntity);

        if (attrEntity.getAttrType() == ProductConstant.AttrEnum.ATTR_TYPE_BASE.getCode()) {
            //1、修改分组关联
            AttrAttrgroupRelationEntity relationEntity = new AttrAttrgroupRelationEntity();
            relationEntity.setAttrGroupId(attr.getAttrGroupId());
            relationEntity.setAttrId(attr.getAttrId());

            Integer count = attrAttrgroupRelationDao.selectCount(new QueryWrapper<AttrAttrgroupRelationEntity>()
                    .eq("attr_id", attr.getAttrId()));

            //分组存在就修改，否则就新增分组在关联表中，  这里分组已经存在了分组表中的，相当于用关联表把数据读过来而已
            if (count>0){
                //注意这样的更新方式
                attrAttrgroupRelationDao.update(relationEntity,new UpdateWrapper<AttrAttrgroupRelationEntity>()
                        .eq("attr_id",attr.getAttrId()));
            }else{
                attrAttrgroupRelationDao.insert(relationEntity);
            }
        }
    }


    /**
     * 根据分组id查找关联的所有基本属性（只有基本属性才有分组关联）
     * @param attrgroupId
     * @return
     */
    @Override
    public List<AttrEntity> getRelationAttr(Long attrgroupId) {

        List<AttrAttrgroupRelationEntity> attrAttrgroupRelationEntities = attrAttrgroupRelationDao
                .selectList(new QueryWrapper<AttrAttrgroupRelationEntity>()
                                .eq("attr_group_id", attrgroupId));

        // 自己写的代码。也能用，不知道哪个好。
//        List<AttrEntity> attrEntities = attrAttrgroupRelationEntities.stream().map((relationEntity) -> {
//            return attrDao.selectById(relationEntity.getAttrId());
//        }).collect(Collectors.toList());

        // 老师写的代码。
        List<Long> attrIds = attrAttrgroupRelationEntities.stream().map(relationEntity -> {
            return relationEntity.getAttrId();
        }).collect(Collectors.toList());
        if (attrIds == null || attrIds.size() == 0){
            return null;
        }
        Collection<AttrEntity> attrEntities = this.listByIds(attrIds);

        return (List<AttrEntity>) attrEntities;
    }


    @Override
    public void deleteRelation(AttrGroupRelationVo[] vos) {
        //因为是数组，下面这种删除会发多次请求，我们希望只发一次请求批量删除
        //attrAttrgroupRelationDao.delete(new QueryWrapper<>().eq("attr_id",1L).eq("attr_group_id",1L));

        List<AttrAttrgroupRelationEntity> relationEntities = Arrays.asList(vos).stream().map((item) -> {
            AttrAttrgroupRelationEntity relationEntity = new AttrAttrgroupRelationEntity();
            BeanUtils.copyProperties(item, relationEntity);
            return relationEntity;
        }).collect(Collectors.toList());
        //批量删除
        attrAttrgroupRelationDao.deleteBatchRelation(relationEntities);
    }


    /**
     * 获取当前分组没有关联的所有属性
     * @param params
     * @param attrgroupId
     * @return
     */
    @Override
    public PageUtils getNoRelationAttr(Map<String, Object> params, Long attrgroupId) {
        //1、当前分组只能关联自己所属的分类里面的所有属性
        AttrGroupEntity attrGroupEntity = attrGroupDao.selectById(attrgroupId);
        Long catelogId = attrGroupEntity.getCatelogId();
        //2、当前分组只能关联别的分组没有引用的属性
        //2.1、当前分类下的其他分组（包括他自己）
        List<AttrGroupEntity> groupEntities = attrGroupDao.selectList(new QueryWrapper<AttrGroupEntity>()
                .eq("catelog_id", catelogId));
        List<Long> attrGroupIds = groupEntities.stream().map((group) -> {
            return group.getAttrGroupId();
        }).collect(Collectors.toList());
        //2.2、这些分组关联的属性
        List<AttrAttrgroupRelationEntity> relation = attrAttrgroupRelationDao.selectList(
                new QueryWrapper<AttrAttrgroupRelationEntity>().in("attr_group_id", attrGroupIds));
        List<Long> attrIds = relation.stream().map((item) -> {
            return item.getAttrId();
        }).collect(Collectors.toList());
        //2.3、从当前分类中的所有属性中移除这些属性
        QueryWrapper<AttrEntity> wrapper = new QueryWrapper<AttrEntity>()
                .eq("catelog_id", catelogId)
                .eq("attr_type",ProductConstant.AttrEnum.ATTR_TYPE_BASE.getCode());
        if (attrIds!=null && attrIds.size()>0){
            wrapper.notIn("attr_id", attrIds);
        }
        String key = (String) params.get("key");
        //模糊查询
        if (!StringUtils.isEmpty(key)){
            wrapper.and((w)->{
                w.eq("attr_id", key).or().like("attr_name", key);
            });
        }
        IPage<AttrEntity> page = this.page(new Query<AttrEntity>().getPage(params), wrapper);

        PageUtils pageUtils = new PageUtils(page);
        return pageUtils;
    }
}